Sullair WSPC - Unload (Remote) Button; Sensor Calibration; P2 Pressure Transducer Calibration

WSPC USER INTERFACE Part 2: Administrator Level
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6.5.8 Unload (Remote) Button
The administrator may set up the controller for remote control by Modbus. To do
so, select the “Modbus timer 1” to control the “Remote Unload” function above.
Also select “Remote”, Hours”, or “ComNum” Sequence mode on the User’s
“Adjustments” tab to enable remote control.
When this is done, an additional button labeled “Unload” will appear under the
“Connection” button in the Status Bar. See Figure 6.12. Click on the “Unload”
button to toggle the compressor operation. A bright yellow box next to the
Unload button indicates that the machine is being forced to unload. A darkened
yellow box next to the button indicates that the machine will operate normally.
If continuous communication from the PC is not received, the compressor will
revert to normal operation within a couple minutes.
Figure 6.12 Unload Button During Remote Operation
Unload
Button
6.5.9 Sensor Calibration
The compressor is equipped with sensors that monitor and measure various
characteristics of the compressor performance. These values are received at the
WS Controller as analog input signals from the sensor. Most sensors input can
be adjusted to calibrate the reading at the controller with the actual measured
value at the sensor location. This section will describe the steps necessary to
calibrate the Line Pressure transducer. Calibrate other sensors in the system in
a similar manner.
6.5.10 P2 Pressure Transducer Calibration
The Line pressure transducer input measurement is assigned to analog input AI4
at the controller. This pressure transducer measures the output line pressure at
the compressor main header. Over time, the pressure transducer may vary
slightly producing an inaccurate reading at the controller. Periodically and prior
to operating multiple controllers in a sequence, the controller should be calibrated
to reflect the same pressure measurement as that measured at the Line
transducer location. The calibration should be performed when the system is at
a stable pressure with minimal load on the output lines.
Use the following steps to calibrate the WS Controller Line pressure reading
(refer to Figure 6.11):
1. Measure the parameter (Line pressure) at the sensor (transducer) location
using an independent certified gauge.